Step 1: Understanding the Concept:
Charles Correa was a pioneer of urban planning in post-independence India.
Step 2: Detailed Explanation:
In the early 1970s, Charles Correa, along with Shirish Patel and Pravina Mehta, proposed the planning of "New Bombay" (Navi Mumbai) as a counter-magnet to decongest South Mumbai.
His vision focused on mass transport, high-density low-rise housing, and incremental building.
Step 3: Final Answer:
The correct city is Navi Mumbai.